Underscore mixins for function binding helpers

gistfile1.js

// Run with jsFiddle at http://jsfiddle.net/MarkRushakoff/jQwGz/

_.mixin({
    bindFiltered : function(object, filterFunc) {
        var funcNames = _(object).chain().functions().filter(filterFunc).value();
        var args = [object].concat(funcNames);
        return _.bindAll.apply(_, args);
    },
    
    bindMatching : function(object, regex) {
        return _.bindFiltered(object, function(name) { return name.match(regex); });
    }
});


(function runTests() {
    test("bindFiltered", function() {
        var moe = {
            name : 'Moe',
            sayHi : function() {
                return "Hi from " + this.name;
            },
            greetEveryone : function() {
                return "Greetings from " + this.name;
            },
            sayGoodbye : function() {
                return "Bye from " + this.name;
            }            
        };
        
        var curly = {
            name : "Curly"
        };
        
        _.bindFiltered(moe, function(funcName) {return funcName.length > 7;});
        
        // Two functions should be adequate for test, but I wanted to make sure that
        // `apply` was used correctly in the definition of bindFiltered.
        curly.sayHi = moe.sayHi;
        curly.greetEveryone = moe.greetEveryone;
        curly.sayGoodbye = moe.sayGoodbye;
        
        equals(curly.sayHi(), "Hi from Curly", "bindFiltered does not bind functions that do not pass the filter");
        equals(curly.greetEveryone(), "Greetings from Moe", "bindFiltered binds functions that pass the filter");
        equals(curly.sayGoodbye(), "Bye from Moe", "bindFiltered binds functions that pass the filter");
    });
    
    test("bindMatching", function() {
        var moe = {
            name : 'Moe',
            sayHi : function() {
                return "Hi from " + this.name;
            },
            greetEveryone : function() {
                return "Greetings from " + this.name;
            },
            sayGoodbye : function() {
                return "Bye from " + this.name;
            }            
        };
        
        var curly = {
            name : "Curly"
        };
        
        _.bindMatching(moe, /^say/);
        
        curly.sayHi = moe.sayHi;
        curly.greetEveryone = moe.greetEveryone;
        curly.sayGoodbye = moe.sayGoodbye;
       
        equals(curly.sayHi(), "Hi from Moe", "bindMatching binds functions whose names match the regex");
        equals(curly.greetEveryone(), "Greetings from Curly", "bindMatching does not bind functions whose names do not match the regex");
        equals(curly.sayGoodbye(), "Bye from Moe", "bindMatching binds functions whose names match the regex");
    });
})();